定义一个父类（比如多边形），再定义一些子类（比如三角形，四边形等等）放在容器里，子类继承父类。再将子类从容器中输出。 求源程序！！！
ArrayList<Shape> list = new ArrayList<Shape>();
Triangle triangle = new Triangle();
list.add(triangle);
System.out.printl(list.get(0));
Triangle triangle = new Triangle();
list.add(triangle);
System.out.printl(list.get(0));
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第1个回答 2014-04-24
class Shape {
Shape(){
System.out.println("基础类型初始化");
}
public void area(){}
}
class TriAngle extends Shape {
int width,high;
public TriAngle(int width,int high){
this.width = width;
this.high = high;
}
public void area(){
System.out.println("三角形面积："+ (width*high)/2);
}
}
class RectAngle extends Shape {
int width,high;
public RectAngle(int width,int high){
this.width = width;
this.high = high;
}
public void area(){
System.out.println("矩形面积："+ (width*high)/2);
}
}
public class ShapeAreaTest {
public static void main(String args[]){
Shape baseShape;
baseShape = new TriAngle(10,10);
baseShape.area();
baseShape = new RectAngle(10,10);
baseShape.area();
}
}追问
Shape(){
System.out.println("基础类型初始化");
}
public void area(){}
}
class TriAngle extends Shape {
int width,high;
public TriAngle(int width,int high){
this.width = width;
this.high = high;
}
public void area(){
System.out.println("三角形面积："+ (width*high)/2);
}
}
class RectAngle extends Shape {
int width,high;
public RectAngle(int width,int high){
this.width = width;
this.high = high;
}
public void area(){
System.out.println("矩形面积："+ (width*high)/2);
}
}
public class ShapeAreaTest {
public static void main(String args[]){
Shape baseShape;
baseShape = new TriAngle(10,10);
baseShape.area();
baseShape = new RectAngle(10,10);
baseShape.area();
}
}追问
额。。。。 想问一下 容器在哪里？
追答好吧，本来想补充的，你都已经采纳了，写这么多都白搭了
